The Diagnosis of Concerted Organic Mechanisms

Williams, Andrew
(1994)
The Diagnosis of Concerted Organic Mechanisms.
Chemical Society Reviews,
23
(2).
pp. 93-100.
ISSN 0306-0012.
(doi:10.1039/CS9942300093)
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Abstract

the concept of concertedness is paramount in all discussions of reaction mechanisms. The criterion that a concerted mechanism has a single transition state and hence possesses no intermediates enables the unambiguous diagnosis of these mechanisms. This review describes current experimental techniques which provide unequivocal evidence against processes involving intermediates; such techniques therefore indicate concertedness. Contemporary evidence is discussed for reactions, such as displacements at unsaturated centres, not hitherto regarded as capable of supporting concerted mechanisms.